Steps to reproduce:
- Open a page in IE11, using VisualEditor.
- Click the "switch to source editing" button in the toolbar or the "edit source" tab.
- Observe a brief flash of the switching progress bar, then nothing.
Console contains:
SCRIPT5007: Unable to get property 'blur' of undefined or null reference ve.ce.Surface.js (520,2)
This is an attempt to call:
this.getElementDocument().activeElement.blur();